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Laws of thermodynamics

Posted: Sun Feb 16, 2020 9:19 pm
by Jessica Castellanos
What are the three laws of thermodynamics? I was a bit confused when they were mentioned in class.

Re: Laws of thermodynamics

Posted: Sun Feb 16, 2020 9:35 pm
by Eugene Chung 3F
1. delta U = heat+work
2. For reversible system, deltaS of universe equals 0.
3. at 0K for a perfectly ordered molecule, the entropy change is 0

Re: Laws of thermodynamics

Posted: Sun Feb 16, 2020 10:10 pm
by Eesha Sohail 1D
The corollary to law #2 is that since no real process is perfectly reversible, change in entropy of the universe is always positive, correct? But why can no real process be completely reversible?